Battery and Electronic Apparatus

This application claims the priority benefit of China application serial no. 202421648666.3, filed on Jul. 11, 2024. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

The disclosure relates to the technical field of batteries, and in particular, relates to a battery and an electronic apparatus.

With the development of social economy, more and more electronic apparatuses, such as new energy vehicles, communication base stations, energy storage containers, etc., use batteries as energy storage and supply devices.

At present, for some battery models, when the outer casings are sealed by laser welding, certain gaps are provided between the side walls and the outer casings due to the bosses formed by stamping at the edges of the cover plates, so that incident laser is easily reflected within the gaps and reach the terminal assemblies inside the outer casings as a result. The terminal assemblies may be damaged, and product quality problems may thereby occur.

In view of the above problems, the disclosure provides a battery and an electronic apparatus through which when welding is performed to seal an outer casing of the battery, laser is prevented from irradiating a terminal assembly, so that the terminal assembly is prevented from being damaged, and product yield is ensured.

The disclosure provides a battery including an outer casing including an opening and a cover plate closing the opening. A portion of the cover plate adjacent to an edge protrudes toward an inner cavity of the outer casing to form a boss. A side of the boss facing away from the inner cavity of the outer casing includes a groove, and a portion of the cover plate located at a radial outer side of the boss forms a connecting edge. The boss is embedded into the opening, and the connecting edge overlaps an end portion of the outer casing. Further, a welding mark is formed between the connecting edge and the end portion of the outer casing. In a direction from a radial outer side to a radial inner side of the cover plate, a size of a cross section of the welding mark gradually decreases. The cross section is determined by a central axis of the cover plate and any radial line. An inner wall of the groove includes a bottom wall and an outer groove wall surrounding an outer periphery of the bottom wall. A stamped groove is provided at connection between the bottom wall and the outer groove wall.

In some embodiments, the outer groove wall includes a straight wall portion extending in a thickness direction of the cover plate. In a radial direction of the cover plate, an outermost end of the stamped groove does not exceed the straight wall portion.

In some embodiments, the stamped groove has a groove cross section taken along a reference plane. The reference plane is determined by the central axis of the cover plate and any radial line. The groove cross section is symmetrically structured at a portion on either side of the central axis in the radial direction of the cover plate.

In some embodiments, the stamped groove has a groove cross section taken along a reference plane. The reference plane is determined by the central axis of the cover plate and any radial line. The groove cross section is an asymmetric structure at a portion on either side of the central axis in the radial direction of the cover plate. Further, a deepest part of the stamped groove is located on a side of a center line L of the groove cross section of the stamped groove in a width direction thereof close to the outer groove wall.

1 2 2 3 3 4 4 1 2 1 2 1 In some embodiments, a height Hof the cover plate at the boss is in a range of 0.8 mm ≤H1≤5 mm, a depth Hof the groove in a thickness direction of the cover plate is in a range of 0.1 mm≤H≤4.5 mm, a depth Hof the stamped groove in the thickness direction of the cover plate is in a range of 0.05 mm≤H≤0.4 mm, an outer side surface of the boss includes a straight line extension portion attached to an inner wall of the outer casing, a height Hof the straight line extension portion in the thickness direction of the cover plate is in a range of H≥0.1 mm, in a radial direction of the cover plate, a width Wof the stamped groove and a width Wof the groove satisfy 0.05≤W/W≤0.2, and/or connection between the outer side surface and a bottom surface of the boss is further provided with an outer chamfer. A radius Rof the outer chamfer is in a range of 0.1 mm≤R1≤1.2 mm.

In some embodiments, the battery further includes a terminal assembly disposed in the outer casing, and a tab is provided at one end of the terminal assembly facing the cover plate. A portion of the bottom wall other than the stamping groove is provided with a welding region, and the cover plate is electrically connected to the tab through the welding region.

In some embodiments, the battery further includes a current-collecting plate located between the cover plate and the tab and connected to the welding region of the cover plate and the tab. The boss abuts against the current-collecting plate.

In some embodiments, in the radial direction of the cover plate, a minimum spacing T between the stamped groove and the welding region satisfies 0.2 mm≤T≤1 mm.

In some embodiments, hardness of the cover plate is greater than or equal to 100 HV.

The second aspect of the disclosure further provides an electronic apparatus including the battery provided by the first aspect of the disclosure.

According to an embodiment of the disclosure, in the battery, the boss is provided at the edge of the cover plate, so that the boss may be embedded into the opening of the outer casing. The boss is provided with the connecting edge that is overlapped with and welded to the end surface of the outer casing along the radial outer side, and the groove is provided on the side of the boss facing away from the terminal assembly. The stamped groove is formed by stamping in the groove. During the formation process of the stamped groove, due to the pressure generated by stamping equipment, metal at the connection between the bottom wall and the outer groove wall of the groove is squeezed to flow toward the outer side of the boss. The chamfer on the side of the boss facing the inner wall of the outer casing is decreased, the straight line extension portion of the outer side surface of the boss is lengthened, and the contact between the outer side surface of the boss and the inner wall of the outer casing is improved, so that the boss better blocks the laser. In this way, when the laser welding equipment is used to weld the gap between the connecting edge and the end surface of the outer casing, after the laser enters the inside of the outer casing, the laser is prevented from reflecting in the gap between the outer side surface of the boss and the inner wall of the outer casing. The laser is thus prevented from irradiating the terminal assembly and causing damage to the terminal assembly, so the welding quality of the battery is improved, and product yield is ensured.

100 —battery; 1 11 12 —outer casing:—side wall:—top wall; 2 21 210 211 212 213 22 221 222 223 2231 224 23 24 25 —cover plate,—boss,—outer side surface,—outer chamfer,—straight line extension portion,—bottom surface,—groove,—inner chamfer,—bottom wall,—outer groove wall,—straight wall portion,—welding region,—stamped groove,—connecting edge,—welding mark; 3 31 32 321 322 323 33 33 332 34 —terminal assembly,—tab,—positive terminal sheet,—positive current-collecting plate,—positive active coating layer,—positive tab,—negative terminal sheet,—negative current collector,—negative active coating layer,—separator; and 4 5 6 —current-collecting plate,—positive current-collecting plate,—terminal post, L—center line.

In order to make the above-mentioned purposes, features, and advantages of the embodiments of the disclosure more apparent and understandable, the technical solutions in the embodiments of the disclosure are to be described clearly and completely in together with the accompanying drawings of the embodiments of disclosure. Obviously, the described embodiments are only a part of the embodiments of the disclosure, not all of the embodiments. Based on the embodiments in the disclosure, all other embodiments obtained by a person having ordinary skill in the art without creative labor are within the scope of protection of the disclosure.

With the development of social economy, more and more electronic apparatuses, such as new energy vehicles, communication base stations, energy storage containers, etc., use batteries as energy storage and supply devices. At present, for some battery models, stamping processes are adopted to provide bosses at the edges of cover plates, with the bosses embedded into the outer casings. Laser welding approaches are then used to seal the outer casings. However, for steel casing batteries or other batteries with higher outer casing strength, their cover plates, due to their greater strength, are more difficult to form during stamping, which may easily cause the chamfers on the side walls of the stamped bosses used for mating with the outer casings to be larger. A larger chamfer may lead to a shorter straight line portion on the side wall of the boss, or even no straight line portion, resulting in a certain gap between the side wall of the boss and the outer casing. Thus, when the mating seam between the cover plate and the outer casing is welded, the incident laser may easily reflect within the gap and reach the terminal assembly inside the outer casing. The terminal assembly may be damaged, and product quality issues may thereby occur.

100 In view of the foregoing, the embodiment provides a battery, which may be a primary battery or a secondary battery. A primary battery refers to a battery that cannot be recharged after discharge, while a secondary battery refers to a battery that can be reused after discharge through charging to reactivate the active materials. The battery may be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-cadmium battery, etc., which is not limited by the embodiments of the disclosure.

1 FIG. 2 FIG. 100 1 2 3 1 1 3 100 1 1 2 1 With reference tototogether, specifically, the batteryof this embodiment may include an outer casing, a cover plate, and a terminal assembly. Herein, one end of the outer casingis provided with an opening, and an inner cavity of the outer casingacts as an accommodating cavity for the terminal assembly. Taking the batteryas a cylindrical battery as an example, its outer casingmay be in the form of a cylindrical tube with the opening at a top end or at a bottom end. An inner side of the outer casingdefines a cylindrical accommodating cavity, and the cover platemay be covered at the opening of the outer casingand seal the opening.

3 FIG. 3 1 31 3 2 31 2 2 31 4 2 4 Referring to, the terminal assemblyis disposed in the inner cavity of the outer casing, a tabis provided at an end of the terminal assemblyfacing the cover plate, and the tabis electrically connected to the cover plate. For instance, the cover platemay be a negative cover plate, and the tabmay be a negative tab. The negative cover plate and the negative tab may be directly welded to achieve electrical connection, or the electrical connection between the negative cover plate and the negative tab may be achieved through an intermediate transferring member such as a current-collecting plate. In this case, both the negative cover plateand the negative tab are welded to the current-collecting plate.

2 FIG. 1 11 12 11 12 12 11 100 5 6 323 3 6 5 6 3 5 6 323 3 4 100 31 3 2 3 Referring to, the outer casingfurther includes a side walland a top wall. The side wallis arranged around a periphery of the top wall, and the top wallis located at one end of the side wallopposite to the opening. The batteryis further provided with a positive current-collecting plateand a terminal postpassing through the top wall. A positive tabis provided at one end of the terminal assemblyfacing the terminal post, the positive current-collecting plateis arranged between the terminal postand the terminal assembly, and the positive current-collecting plateis welded to both the terminal postand the positive tabof the terminal assembly. Herein, the abovementioned current-collecting platemay act as a negative current-collecting plate of the battery, while the tabat the end of the terminal assemblyfacing the cover plateacts as the negative tab of the terminal assembly.

7 FIG. 3 32 33 34 32 321 322 321 33 331 332 331 100 100 32 34 33 3 Optionally, referring to, the terminal assemblymay include a positive terminal sheet, a negative terminal sheet, and a separator. The positive terminal sheetincludes a positive current collectorand a positive active coating layercoated on a surface of the positive current collector. The negative terminal sheetincludes a negative current collectorand a negative active coating layercoated on a surface of the negative current collector. Taking the batteryas a cylindrical batteryas an example, the positive terminal sheet, the separator, and the negative terminal sheetare stacked in sequence and then wound to form a wound terminal assembly.

100 32 34 33 3 32 34 33 32 33 32 33 34 3 Certainly, in other possible embodiments, the batterymay be a rectangular battery. In this case, the positive terminal sheet, the separator, and negative terminal sheetmay be sequentially stacked and then wound to form a wound terminal assembly. Alternatively, the positive terminal sheet, the separator, and the negative terminal sheetare all multi-layered, with the positive terminal sheetand the negative terminal sheetstacked in an alternating manner, and the positive terminal sheetand negative terminal sheetseparated by the separatorto form a stacked terminal assembly.

3 FIG. 1 FIG. 2 FIG. 2 1 21 21 1 22 21 2 21 2 22 21 2 2 21 24 21 24 1 24 1 25 24 1 25 2 2 Referring to, a portion of the cover plateadjacent to an edge protrudes toward the inner cavity of the outer casingto form a boss, and a side of the bossfacing away from the inner cavity of the outer casingincludes a groove. For instance, the bossmay be formed by stamping the edge of the cover plate. During stamping, the bossis formed on an inner surface (i.e., the surface facing the accommodating cavity) of the cover plate. The grooveis formed on the side of the bossfacing away from the accommodating cavity (i.e., an outer surface of the cover plate), and a portion of the cover plateat a radial outer side of the bossforms a connecting edge. When the bossis inserted in the opening, the connecting edgeoverlaps with an end portion of the outer casing, and the connecting edgeis welded to an end surface of the outer casing. For stance, the welding approach may be laser welding, ultrasonic welding, etc. A welding markis formed between the connecting edgeand the end surface of the outer casing. A size of a cross section of the welding markgradually decreases in a direction from a radial outer side to a radial inner side of the cover plate. The cross section herein is determined by a central axis of the cover plateand any radial line, such as the A-A cross section shown inand.

3 FIG. 3 FIG. 1 2 24 1 25 25 100 24 1 25 25 24 1 2 25 24 1 Referring to, it should be noted that in this embodiment, the laser welding equipment may perform laser seam welding from the side of the outer casing, in a radial direction of the cover platetoward a seam between the connecting edgeand the end surface of the outer casing(as shown by the arrow direction at the welding markin), to form the welding mark. Moreover, during the welding process, the laser welding equipment may remain in a fixed position, with only the batteryrotating to perform the welding. When the laser welding method is adopted to weld the connecting edgeand the outer casing, in a transmission direction of the laser and away from the welding equipment, the size of the cross-sectional of the welding mark, such as a width of the cross section, gradually decreases. In this embodiment, the welding markis formed between the connecting edgeand the end surface of the outer casing, and in the direction from the radial outer side toward the radial inner side of the cover plate, the size of the cross section of the welding markgradually decreases. By using laser seam welding approach to weld the fitting seam between the connecting edgeand the outer casing, the gap can be sealed well, and with mature and reliable processes, the welding quality can be ensured.

3 FIG. 22 222 223 222 23 222 223 23 221 222 223 23 22 With reference to, an inner wall of the grooveincludes a bottom walland an outer groove wallsurrounding an outer periphery of the bottom wall. A stamped grooveis provided at connection between the bottom walland the outer groove wall. That is, the stamped grooveis formed on an inner chamferat the connection between the bottom walland the outer groove wall. Optionally, the stamped grooveand the groovemay be formed together in a same stamping process.

23 2 21 211 210 21 223 22 222 22 212 21 212 210 21 1 2 210 21 1 24 1 25 24 1 210 21 1 3 3 23 222 223 22 23 22 222 223 1 211 21 212 210 21 210 21 1 1 24 1 21 3 3 It should be noted that in the case where the stamped grooveis not provided, when the cover plateis stamped to form the boss, since an outer chamferat intersection of an outer side surfaceof the boss(opposite to the outer groove wallof the groove) and the bottom surface (opposite to the bottom wallof the groove) is relatively large, a straight line extension portionof the outer surface of the boss(this straight line extension portionis a portion where the outer side surfaceof the bosscontacts with the outer casing, and this portion extends in an axial direction of the cover plate) is relatively short. A certain gap is provided between the outer side surfaceof the bossand the inner wall of the outer casing. In this way, when the connecting edgeand the end surface of the outer casingare welded to form the welding mark, the laser emitted by the laser welding equipment toward the gap between the connecting edgeand the end surface of the outer casing, after entering the inner cavity, may easily reflect in the gap between the outer side surfaceof the bossand the inner wall of the outer casingand finally reflect onto the terminal assembly. The terminal assemblymay thereby be damaged. However, in this embodiment, by providing the stamped grooveat the connection between the bottom walland the outer groove wallof the groove, during the forming process of the stamped groove, the stamping equipment compresses the inner wall of the groove, causing a material at the connection between the bottom walland the outer groove wallto flow and deform toward the outer casingside. The outer chamferof the bossis decreased, the straight line extension portionof the outer side surfaceof the bossis lengthened, and the contact between the outer side surfaceof the bossand the inner wall of the outer casingis improved. In this way, even if the laser enters the inside of the outer casingthrough the gap between the connecting edgeand the end surface of the outer casing, the bossmay block the laser, so the laser is prevented from reflecting onto the terminal assemblyand causing damage to the terminal assembly.

100 21 2 21 1 21 24 1 22 21 3 23 222 223 22 23 222 223 22 21 1 212 210 21 210 21 1 21 24 1 1 210 21 1 3 3 100 According to an embodiment of the disclosure, in the battery, the bossis provided at the edge of the cover plate, so that the bossmay be embedded into the opening of the outer casing. The bossis provided with the connecting edgethat is overlapped with and welded to the end surface of the outer casingalong the radial outer side, and the grooveis provided on the side of the bossfacing away from the terminal assembly. The stamped grooveis provided at the connection between the bottom walland the outer groove wallof the groove. During the formation process of the stamped groove, due to the pressure generated by the stamping equipment, the metal at the connection between the bottom walland the outer groove wallof the grooveis squeezed to flow toward the outer side of the boss. The chamfer on the side of the bossfacing the inner wall of the outer casingis decreased, the straight line extension portionof the outer side surfaceof the bossis lengthened, and the contact between the outer side surfaceof the bossand the inner wall of the outer casingis improved, so that the bossmay better block the laser. In this way, when the laser welding equipment is used to weld the gap between the connecting edgeand the end surface of the outer casing, after the laser enters the inside of the outer casing, the laser is prevented from reflecting in the gap between the outer side surfaceof the bossand the inner wall of the outer casing. The laser is thus prevented from irradiating the terminal assemblyand causing damage to the terminal assembly, so the welding quality of the batteryis improved, and product yield is ensured.

3 FIG. 4 FIG. 23 2 1 223 22 2231 2 2231 212 210 21 2 23 2231 23 22 23 2 223 22 2 23 22 In some embodiments, referring toand, an opening direction of the stamped grooveextends in the axial direction of the cover plateand away from the inner cavity of the outer casing. The outer groove wallof the grooveincludes a straight wall portionextending in a thickness direction of the cover plate, and the straight wall portionand the straight line extension portionof the outer side surfaceof the bossare opposite to each other and parallel. In the radial direction of the cover plate, an outermost end of the stamped groovedoes not exceed the straight wall portion. In this way, it is only necessary to provide a protruding structure matching the stamped grooveon the stamping equipment, and the grooveand the stamped groovemay be simultaneously formed using the stamping equipment. That is, when stamping is performed in the thickness direction of the cover plate, no interference is provided between the protruding structure on the stamping equipment and the outer groove wallof the groovein the thickness direction of the cover plate. After the stamped grooveis processed, the stamping equipment may withdraw from the grooveeasily.

22 23 2 23 22 2 22 23 In addition, an opening direction of the grooveand the opening direction of the stamped grooveare substantially the same. As such, the stamping equipment only needs to perform one stamping in the thickness direction of the cover plateto form the stamped grooveand the groove, so that the manufacturing process of the cover plateis more simple and efficient. Certainly, it may be understood that two stamping processes may also be used, that is, the grooveis stamped first, and the stamped grooveis then stamped.

23 2 2 23 2 23 2 1 FIG. 2 FIG. The stamped groovehas a groove cross section taken along a reference plane (e.g., the A-A cross section shown inand), and the reference plane may be determined by the center axis of the cover plateand any radial line. In other words, the reference plane passes through the center axis and the radial line of the cover plate. Since the stamped grooveis an annular shape around the cover plate, the groove cross section of the stamped grooveat the reference plane includes two portions, with the two portions located on both sides of the center axis of the cover plate.

3 FIG. 2 23 2 23 21 212 210 21 Referring to, in this embodiment, the groove cross section is symmetrically structured at a portion on either side of the central axis in the radial direction of the cover plate. For instance, the stamped grooveon any radial side of the center axis of the cover platemay be formed as V-shaped, U-shaped, or other symmetrical structures. In this way, during the stamping process, a cover plate material corresponding to the stamped groovemay flow uniformly toward the periphery, so the inner chamfer of the bossmay be decreased, and a length of the straight line extension portionon the outer side surfaceof the bossmay be increased.

4 FIG. 2 23 223 23 2 23 23 2 221 211 1 211 21 212 210 21 23 21 1 In some other embodiments, referring to, the groove cross section is an asymmetric structure at a portion on either side of the central axis in the radial direction of the cover plate. Further, a deepest part of the stamped grooveis located on a side of a center line L of the groove cross section in a width direction thereof close to the outer groove wall. Herein, the width direction of the stamped grooveis parallel to the radial direction of the cover plate. As such, compared to the scheme where the stamped groovehas a symmetrical structure, in this embodiment, when processing the stamped groove, the material of the cover platebetween the inner chamferand the outer chamfermay mainly flow and deform toward the outer casingside. Material flow and deformation in other directions are thereby lowered, the outer chamferof the bossis more efficiently decreased, and the length of the straight line extension portionon the outer side surfaceof the bossis increased. The forming efficiency of the stamped grooveis thereby be improved, and the tight fit between the bossand the outer casingmay also be ensured.

6 FIG. 1 2 32 1 1 2 21 21 2 1 2 21 1 2 21 21 21 1 21 2 1 21 21 1 100 In some embodiments, referring to, a height Hof the cover plateat the bossis in a range of 0.8 mm≤H≤5 mm. The height Hof the cover plateat the bossis a sum of a height of the bossand a thickness of a non-boss portion of the cover plate, for example, the value of the height Hof the cover plateat the bossmay be 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm. Certainly, the disclosure does not impose any limitation on this, and the height Hof the cover plateat the bossmay be reasonably selected within the above range according to actual needs. In this way, on one hand, the height of the bossis prevented from being excessively small, for example, less than 0.8 mm, which may result in the bossbeing embedded into the outer casingat an insufficient depth, preventing the bossfrom effectively blocking the laser, and preventing the cover platefrom forming a stable fit with the outer casing. On the other hand, the height of the bossis prevented from being excessively large (e.g., greater than 5 mm), and the bossis thus prevented from occupying too much internal space of the outer casing, so internal space utilization and energy density of the batteryare thus improved.

6 FIG. 2 22 2 2 2 22 2 2 22 2 22 21 21 1 22 21 1 100 22 2 21 In some embodiments, referring to, a depth Hof the groovein the thickness direction of the cover plateis in a range of 0.1 mm≤H≤4.5 mm. For instance, the depth Hof the groovein the thickness direction of the cover platemay be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, or 4.5 mm. Certainly, the disclosure does not impose any limitation on this, and the depth Hof the groovein the thickness direction of the cover platemay be reasonably selected within the above range according to actual needs. In this way, on one hand, the depth of the grooveis prevented from being excessively small, for example, less than 0.1 mm, which may result in the height of the bossbeing excessively small, preventing the bossfrom effectively blocking the laser and from forming a stable fit with the outer casing. On the other hand, the depth of the grooveis prevented from being excessively large (e.g., greater than 4.5 mm), and the bossis thus prevented from occupying too much internal space of the outer casing, so the internal space utilization and energy density of the batteryare thus improved. It can be understood that the depth of the grooveis always less than the thickness of the cover plateat the boss.

6 FIG. 3 23 2 3 3 23 2 3 23 2 23 2 221 211 23 211 21 210 21 1 21 23 222 22 2 23 21 In some embodiments, referring to, a depth Hof the stamped groovein the thickness direction of the cover plateis in a range of 0.05 mm≤H≤0.4 mm. For instance, the depth Hof the stamped groovein the thickness direction of the cover platemay be 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, or 0.4 mm. Certainly, the disclosure does not impose any limitation on this, and the depth Hof the stamped groovein the thickness direction of the cover platemay be reasonably selected within the above range according to actual needs. In this way, on one hand, the situation where the depth of the stamped grooveis excessively small, for example less than 0.05 mm, resulting in insufficient compression of the cover platematerial between the inner chamferand the outer chamferduring the forming process of the stamped groove, is avoided. In the above situation, the outer chamferof the bossis not effectively reduced, and the outer side surfaceof the bosscannot effectively adhere to the inner wall of the outer casing, making the laser blocking effect of the bosslimited. On the other hand, the situation where the depth of the stamped grooveis excessively large, for example greater than 0.4 mm, causing the bottom wallof the grooveto be punctured and resulting in damage and scrapping of the cover plate, is avoided. It can be understood that the depth of the stamped grooveis always less than the wall thickness of the boss.

6 FIG. 210 21 212 210 21 212 4 212 2 4 4 212 2 4 212 2 212 21 1 25 24 1 212 21 1 100 In some embodiments, referring to, the outer side surfaceof the bossincludes the straight line extension portion. For instance, a portion of the outer side surfaceof the bossexcept for the inner chamfer forms the straight line extension portion. A height Hof the straight line extension portionin the thickness direction of the cover plateis in a range of 0.1 mm≤H≤2 mm. For instance, the height Hof the straight line extension portionin the thickness direction of the cover platemay be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, or 2 mm. Certainly, the disclosure does not impose any limitation on this, and the height Hof the straight line extension portionin the thickness direction of the cover platemay be reasonably selected within the above range according to actual needs. In this way, on one hand, the situation where the height of the straight line extension portionbeing excessively small, for example, less than 0.1 mm, resulting in the embedding depth of the bossinto the outer casingbeing excessively shallow, is avoided. In the above situation, the laser at the welding markbetween the connecting edgeand the end surface of the outer casingmay not be well blocked. On the other hand, the height of the straight line extension portionmay be prevented from being excessively large (e.g., greater than 2 mm), and the bossis thus prevented from occupying too much internal space of the outer casing, so the internal space utilization and energy density of the batteryare thus improved.

6 FIG. 2 1 23 2 22 1 2 1 2 1 23 2 2 22 1 2 22 23 23 23 223 22 211 21 212 210 21 24 2 1 21 In some embodiments, referring to, in the radial direction of the cover plate, a width Wof the stamped grooveand a width Wof the groovesatisfy 0.1≤W/W≤1. For instance, a ratio of Wto Wmay be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1. When the ratio is 1, the width Wof the stamped groovein the radial direction of the cover plateis the same as the width Wof the groove. Certainly, the disclosure does not impose any limitation on this, and the ratio of Wto Wmay be reasonably selected within the above range according to actual needs. In this way, it may ensure that the processing equipment can smoothly extend into the grooveto process the stamped groove, and ensure that when processing the stamped groove, it can better push the cover plate material at the stamped grooveto flow toward the outer groove wallof the groove, so as to reduce the outer chamferof the bossand increase the length of the straight line extension portionon the outer side surfaceof the boss. As such, when laser seam welding is performed between the connecting edgeof the cover plateand the end portion of the outer casing, the bossmay better block the laser.

6 FIG. 211 210 213 21 211 221 1 211 1 1 211 1 211 23 211 21 1 210 21 1 In some embodiments, referring to, an outer chamferis also provided at the connection between the outer side surfaceand the bottom surfaceof the boss. The outer chamferis opposite to the inner chamfer. A radius Rof the outer chamferhas a value range of: 0.1 mm≤R≤1.2 mm. For example, the radius Rof the outer chamfermay be 0.1 mm, 1.2 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, and 1.2 mm. Certainly, the disclosure does not impose any limitation on this, and the radius Rof the outer chamfermay be reasonably selected within the above range according to actual needs. That is, after processing the stamped groove, the radius of the outer chamferof the bossfacing the outer casingis within the above range, which may ensure that the outer side surfaceof the bossadheres well to the inner wall of the outer casingto block the laser.

222 22 23 224 224 2 2 31 224 224 31 2 31 224 31 4 2 31 In some embodiments, the bottom wallof the groove, except for the portion with the stamped groove, is provided with a welding region. The welding regionis a welding mark formed by welding the cover platewith the internal components of the battery, and the cover platemay be electrically connected to the tabthrough the welding region. For instance, the welding regionand the tabmay be directly welded to achieve electrical connection between the cover plateand the tab. Alternatively, the welding regionmay also achieve electrical connection with the tabthrough an intermediate transferring member such as the current-collecting plate. As such, there are various approaches for connecting the cover platewith the tab, which may be rationally selected according to actual needs.

100 4 2 31 4 224 2 31 2 31 4 4 2 31 21 4 21 4 4 3 1 21 2 21 4 4 2 21 224 21 21 4 2 4 21 In a specific example, the batterymay also include the current-collecting platedisposed between the cover plateand the tab. The current-collecting plateis welded to the welding regionof the cover plateand the tab. In other words, the cover plateand the tabachieve a transition connection through the current-collecting plate, and the current-collecting plateacts as an intermediate transferring member between the cover plateand the tab. Herein, the bossmay abut against the current-collecting plate, so that, on one hand, the bossmay be used to press the current-collecting plateto ensure that the position of the current-collecting plateand the terminal assemblyin the outer casingis fixed. On the other hand, since the bossis a part of the structure of the cover plateand is a metal part, even if the bossis not electrically connected to the current-collecting plate(for example, a middle region of the current-collecting plateis welded to the cover plate, and the bossand the welding regionare spaced apart in the radial direction), the bosscan still be used to conduct heat. In some possible embodiments, the bossmay be directly welded to the current-collecting plateto achieve conduction between the cover plateand the current-collecting plate. In this case, the bossmay achieve both electrical connection and heat conduction.

222 22 4 2 23 23 23 4 224 222 224 23 2 4 21 4 Understandably, when the laser penetration welding approach is used to weld the bottom wallof the grooveand the current-collecting plate, a laser irradiation direction is the same as the thickness direction of the cover plate. Laser energy density when the laser irradiates on a surface of an object to be welded is related to a distance from a laser focus to a welding surface. Since an inner wall surface of the stamped grooveis not a plane perpendicular to the laser, if welding is performed inside the stamped groove, different welding positions have different distances from the laser focus. Different laser energy densities may thus be provided at different points, which may lead to inconsistent welding depths at various points, so effective connection between the stamped grooveand the current-collecting platemay not be ensured. In this embodiment, the welding regionis disposed on the straight portion of the bottom wall, so that the welding regionavoids the stamped groove, so that the laser energy is ensured to be better focused and penetrates the cover plateto reach the current-collecting plate, and an effective and reliable connection is thus formed between the bossand the current-collecting plate.

6 FIG. 2 22 2 2 2 22 2 2 22 2 22 22 22 23 22 2 100 In some embodiments, referring to, the width Wof the groovein the radial direction of the cover plateis in a range of 2 mm≤W≤15 mm. For instance, the width Wof the groovein the radial direction of the cover platemay be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm. Certainly, the disclosure does not impose any limitation on this, and the width Wof the groovein the radial direction of the cover platemay be reasonably selected within the above range according to actual needs. As such, on one hand, the width of the grooveis prevented from being excessively small. For instance, when the width is less than 2 mm, it is difficult for the welding equipment to extend into the grooveto perform welding operations, and it is difficult for the processing equipment to extend into the grooveto process the stamped groove. On the other hand, the width of the grooveis prevented from being excessively large. For instance, when the width is greater than 15 mm, an area of a surface of the cover platefor thermal contact with a module cooling system may be excessively small, which is not conducive to the external heat dissipation of the battery.

3 FIG. 6 FIG. 3 224 2 3 3 224 2 3 224 2 224 21 4 224 In some embodiments, referring toandtogether, the width Wof the welding regionin the radial direction of the cover platehas a value range of: 0.5 mm≤W<13 mm. For example, the width Wof the welding regionin the radial direction of the cover platemay be 0.5 mm, 1 mm, 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, or 13 mm. Certainly, the disclosure does not impose any limitation on this, and the width Wof the welding regionin the radial direction of the cover platemay be reasonably selected within the above range according to actual needs. In this way, on one hand, the width of the welding regionis prevented from being excessively small. For instance, when the width is less than 0.5 mm, a welding area between the bossand the current-collecting plateis excessively small, resulting in high resistance at the welding point and poor current-carrying capacity. On the other hand, the width of the welding regionis prevented from being excessively large. For instance, when the width is greater than 13 mm, the welding area is excessively large, making it difficult to ensure welding quality.

3 FIG. 2 23 224 23 224 23 224 23 23 224 In some embodiments, referring to, in the radial direction of the cover plate, a minimum spacing T between the stamped grooveand the welding regionsatisfies 0.2 mm ≤T≤1 mm. For instance, the minimum spacing T between the stamped grooveand the welding regionmay be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. Certainly, the disclosure does not impose any limitation on this, and the minimum spacing T between the stamped grooveand the welding regionmay be reasonably selected within the above range according to actual needs. In this way, welding energy is prevented from being transferred to the stamped groovedue to excessively small spacing, so welding explosion points are prevented from appearing. Further, interference between the stamped grooveand the welding regionis prevented from occurring, and stress during the welding process is released.

2 2 2 2 In some embodiments, hardness of the cover plateis greater than or equal to 100 HV. In this way, it may ensure that the cover platepossesses sufficient strength and good pressure resistance performance. For instance, the cover platemay be a steel structural component, for example, the cover platemay be a cold-rolled carbon steel sheet and strip for general use (SPCC).

In the following paragraphs, an electronic apparatus of the second aspect of the disclosure is described.

The electrical apparatus of this embodiment may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be but not limited to a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle, etc. The spacecraft includes but not limited to an airplane, a rocket, a space shuttle, a spaceship, etc. The electric toy includes but not limited to a stationary or mobile electric toy, for example, a game machine, an electric car toy, an electric boat toy, an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and an electric tool for railway use, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, an electric planer, etc. The electronic apparatus may be a battery module, a battery pack, etc. The above electronic apparatus is not particularly limited in the embodiments of the disclosure.

100 100 100 The electronic apparatus may include: an apparatus body and the batteryin the above embodiments. The apparatus body may include a battery compartment, where the batteryis provided in the battery compartment and electrically connected to the apparatus body. For instance, a power supply interface may be provided in the battery compartment, and the batterymay be connected to the power supply interface.

100 100 In the electronic apparatus of the embodiments of the disclosure, by providing the batteryin the above embodiments, the welding quality of the batteryis improved, and improved user experience is thus provided.

It shall be pointed out that phrases such as “an embodiment”, “embodiments”, “exemplary embodiments”, “some embodiments”, etc. mentioned in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes such specific features, structures, or characteristics. Moreover, such phrases do not necessarily refer to the same embodiment. Further, when describing specific features, structures, or characteristics in together with the embodiments, implementing such features, structures, or characteristics in combination with other embodiments, whether explicitly or implicitly described, is within the knowledge of a person having ordinary skill in the art.

In general, terms shall be understood at least partially based on their contextual usage. For instance, at least partially according to the context, the term “one or more” used in the text may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense. Similarly, at least partially according to the context, terms such as “a” or “the” may also be understood to convey singular usage or to convey plural usage.

It should be easily understood that “on”, “above”, and “over” in this disclosure shall be interpreted in the broadest way, so that “on” not only means “directly on something”, but also includes the meaning of “on something” with intermediate features or layers in between, and “above” or “over” not only includes the meaning of “above” or “over something”, but may also include the meaning of “above” or “over something” without intermediate features or layers in between (i.e., directly on something).

90 In addition, for ease of explanation, spatial relative terms may be used in the text, such as “below”, “beneath”, “lower”, “above”, “upper”, etc., to describe the relationship of one element or feature to another element or feature as shown in the figures. The spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotateddegrees or at other orientations), and the spatial relative descriptive words used in the text may be interpreted accordingly.

Finally, it is worth noting that the foregoing embodiments are merely described to illustrate the technical means of the disclosure and should not be construed as limitations of the disclosure. Even though the foregoing embodiments are referenced to provide detailed description of the disclosure, people having ordinary skill in the art should understand that various modifications and variations can be made to the technical means in the disclosed embodiments, or equivalent replacements may be made for part or all of the technical features; nevertheless, it is intended that the modifications, variations, and replacements shall not make the nature of the technical means to depart from the scope of the technical means of the embodiments of the disclosure.